Most FSB products are 'implements' for the opening and closing of doors and windows.

Sooner or later, depending on what they are made of and where they are fitted, they will inevitably begin to show signs of wear. The properties of this material can be summarized as follows:

Stainless steel is commonly regarded as being indestructible. In fact, even stainless steel can develop scratches and traces of rust. This latter is the phenomenon known as 'flash rust', which can be removed with the aid of standard cleansing agents.

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